188311945 has 16 divisors (see below), whose sum is σ = 238803840. Its totient is φ = 142159104.

The previous prime is 188311943. The next prime is 188311957. The reversal of 188311945 is 549113881.

It is a happy number.

188311945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 188311945 - 2¹ = 188311943 is a prime.

It is a super-2 number, since 2×188311945² = 70922777259366050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 188311898 and 188311907.

It is not an unprimeable number, because it can be changed into a prime (188311943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21217 + ... + 28753.

It is an arithmetic number, because the mean of its divisors is an integer number (14925240).

Almost surely, 2^188311945 is an apocalyptic number.

It is an amenable number.

188311945 is a deficient number, since it is larger than the sum of its proper divisors (50491895).

188311945 is a wasteful number, since it uses less digits than its factorization.

188311945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7824.

The product of its digits is 34560, while the sum is 40.

The square root of 188311945 is about 13722.6799496308. The cubic root of 188311945 is about 573.1821049294.

The spelling of 188311945 in words is "one hundred eighty-eight million, three hundred eleven thousand, nine hundred forty-five".